A contribution to the anatomy of the amphibian and reptilian retina / by J.W. Hulke.

  • Hulke, J. W. (John Whitaker), 1830-1895.
Date:
[between 1870 and 1879?]
Catalogue details

Licence: Public Domain Mark

Credit: A contribution to the anatomy of the amphibian and reptilian retina / by J.W. Hulke. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    in a double series.* II. Muller especially (whose recent death is a heavy loss to histology) and Kdlliker clearly described their segmentation, and their connection with the outer granules.f] 2. Layer of Outer Granuleit. The outer granules are round or rouiidly-oval cells, from tttVit diameter. They have a distinct, bright, central nucleus, and form a thin layer of two or three rows. Eacli is associated with a rod or cone, in the manner already described, so that their number equals these, and each appears, at its opposite pole, to send a fibre inwards. This is really a prolongation of the inner end of the rod, or cone-body. 3. Inter-granule-Layer. Placed between the outer and inner granules this appears in vertical sections as an inconspicuous line. Schultze pointed out that a high power resolves it into a web of fibrous tissue. It is traversed by Muller’s (connective) radial fibres, and by the fibres prolonged beyond the outer granules from the rod and cone-bodies. 4. Layer of Inner Granules. The inner granules, like the outer, are well defined cells. In chromic acid preparations three kinds are distinguishable. I. Small, subglobular, polygonal cells or nuclei, ranging between ^-gVo woVw diameter. These are more numerous; carmine imparts to them a deeper stain; they are less granular in texture, and their refractive power is higher than that of tlie other cells. 2. Large round, or roundly oval cells, from ttwo diameter. These * Vintschgau. Richerche sulla struttura microscopica della Retina del TJomo, degli animali vertebrati, e del Cephalopodi. Sitzmigs Berichte der Akademie der Wissenschaften. Wien. Bd. xi, S. 943—977. t Mitller. Anat. Phys. XJntersuch. iiber die retina beina Mensclien u, Wirbelthieren. Zlschr. f. Wiss. Zool. Siebold ii. Kolliker. Bd. viii, Hft. 1. 1856.